Hello I would love to offer my experience. I actually sent a canon 28-70 2.8 to midwest camera to have it fixed and they advised against the repair based on the scarcity of parts. The 28-70 2.8 has a common issue of a foggy rear element so look for that too. And I do like midwest camera I just got my 70-200 2.8 back from them. It took a month but it's back and works great. So if you do get it I'd really recommend midwest camera for the late model canon repairs.